test/ginkgo: ensure admin server port is not selected dynamically (#10406)

Author: sam-heilbron

changelog/v1.18.0-rc3/safe-ports-e2e.yaml

@@ -0,0 +1,8 @@
+changelog:
+  - type: NON_USER_FACING
+    issueLink: https://github.com/solo-io/solo-projects/issues/7307
+    resolvesIssue: false
+    description: >-
+      Ensure that tests which are dynamically selecting ports always skip port 9095.
+      Due to recent changes, when Gloo is running, this port will always be used.
+      We choose to skip this, as it is the easiest way to avoid issues.

test/ginkgo/parallel/ports.go

@@ -75,7 +75,17 @@ func AdvancePort(p *uint32) uint32 {
 // AdvancePortSafeListen returns a port that is safe to use in parallel tests
 // It relies on pinging the port to see if it is in use
 func AdvancePortSafeListen(p *uint32, retryOptions ...retry.Option) uint32 {
-	return MustAdvancePortSafe(p, portInUseListen, retryOptions...)
+	errIfPortInUse := func(proposedPort uint32) error {
+		if err := portInDenyList(proposedPort); err != nil {
+			return err
+		}
+		if err := portInUseListen(proposedPort); err != nil {
+			return err
+		}
+		return nil
+	}
+
+	return MustAdvancePortSafe(p, errIfPortInUse, retryOptions...)
 }
 
 func portInUseListen(proposedPort uint32) error {
@@ -88,3 +98,16 @@ func portInUseListen(proposedPort uint32) error {
 	// Port should available if the listener closes without an error
 	return ln.Close()
 }
+
+var denyListPorts = map[uint32]struct{}{
+	// See gloo/pkg/servers/admin/server.go
+	// See https://github.com/solo-io/solo-projects/issues/7307 for more details
+	9095: {},
+}
+
+func portInDenyList(proposedPort uint32) error {
+	if _, ok := denyListPorts[proposedPort]; ok {
+		return eris.Errorf("port %d is in deny list", proposedPort)
+	}
+	return nil
+}